CN220604510U - Switching mechanism with mechanical power-off protection function and angle grinder - Google Patents

Abstract

The utility model relates to the technical field of electric tools, in particular to a switching mechanism with a mechanical power-off protection function and an angle grinder, wherein the mechanical power-off protection mechanism comprises: install on the installation casing of electric tool, its characterized in that includes: the micro switch comprises a first end, a second end and a contact, wherein the first end is used for being connected with a battery, and the second end is used for being connected with a motor; the switch assembly is positioned at a first position, the contact is pressed to enable the first end and the second end to be conducted, and when the switch assembly is positioned at a second position, the contact is released and automatically reset to enable the first end and the second end to be disconnected; and a power-off protection assembly for placing the switch assembly in a second position when the battery is not installed; when the battery is installed, potential safety hazards caused by the fact that the switch assembly is in a first position, namely the switch assembly is in an on state, and the motor is electrified are prevented.

Description

Switching mechanism with mechanical power-off protection function and angle grinder

Technical Field

The utility model relates to the technical field of electric tools, in particular to a switching mechanism with a mechanical power-off protection function and an angle grinder.

Background

The angle grinder is a hand-held electric tool for cutting and polishing glass fibre reinforced plastics, and is mainly used for cutting, grinding and brushing metal and stone material, and uses high-speed rotating sheet grinding wheel, rubber grinding wheel and wire wheel to make grinding, cutting, rust-removing and polishing treatment on metal component. When the angle grinder is used in daily life, the operation steps in the normal case are as follows: the battery is firstly installed, then the button switch is turned on to electrify the motor, the button switch is turned off after the motor is used, and finally the power supply is pulled out. But many times the staff can directly lift off the battery for the efficiency of work, often can appear forgetting to turn off the button switch, and in the time of the second use, at the moment of installing the battery, because the button switch is in the on-state, the motor of angle mill can automatic start, and then lets the emery wheel rotate, and the emery wheel has the danger of injury personnel this moment.

Disclosure of Invention

The utility model aims to provide a switching mechanism with a mechanical power-off protection function and an angle grinder, which are used for preventing potential safety hazards caused by the fact that a button switch is in an on state when the angle grinder is provided with a battery, so as to solve the defects of the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a switching mechanism with mechanical power-off protection, comprising:

a switch mechanism with a mechanical power-off protection function, which is arranged on a mounting shell; characterized by comprising the following steps:

install on the installation casing of electric tool, its characterized in that includes:

the micro switch comprises a first end, a second end and a contact, wherein the first end is used for being connected with a battery, and the second end is used for being connected with a motor;

the switch assembly is positioned at a first position, the contact is pressed to enable the first end and the second end to be conducted, and when the switch assembly is positioned at a second position, the contact is released and automatically reset to enable the first end and the second end to be disconnected; and

and a power-off protection assembly for placing the switch assembly in a second position when the battery is not installed.

Preferably, the switch assembly includes: the switch button is positioned at a first position, and the trigger piece presses the contact; when the switch button is in the second position, the trigger releases the contact.

Preferably, the power-off protection assembly includes: the first elastic piece and the push rod, one end of the first elastic piece is propped against the installation shell; the other end of the push rod is abutted against the push rod,

one end of the push rod is used for abutting against the battery, and an unlocking part and an abutting part are arranged on the push rod;

after the battery is dismounted from the mounting shell, the elastic piece is in an extension state and abuts against the push rod, so that the push rod is in a third position, the abutting part abuts against the switch button, the switch button is separated from the first position, and the switch button is limited to return to the first position;

when the battery is installed in the installation shell, the push rod compresses the first elastic piece, and is in the fourth position and does not limit the switch button.

Preferably, the first elastic element is a first spring;

one end of push rod is equipped with spring installation department, and spring installation department includes: the inner diameter limiting bulge is inserted into the inner ring of the first spring, a limiting gap is formed between the inner diameter limiting bulge and the outer diameter limiting plate, and a part of the spring is inserted into the limiting gap, so that the first spring is stably connected with the push rod.

Preferably, a first inclined plane is arranged between the unlocking part and the abutting part and used for guiding the switch button to transit between the unlocking part and the abutting part.

Preferably, the switch button is provided with an abutting part for contacting the unlocking part and the abutting part; the abutting part is provided with a second inclined plane for guiding the switch button to transition between the unlocking part and the abutting part.

Preferably, the push rod is provided with a limit rib, the switch button is provided with a limit part, a limit groove is formed in the limit part, the limit groove is matched with the limit rib, and the limit rib can slide in the limit groove.

Preferably, the trigger piece is provided with an avoidance hole, and the limiting part is in a strip shape and penetrates through the avoidance hole.

Preferably, the device further comprises a second elastic piece, one end of the second elastic piece abuts against the mounting shell, the other end of the second elastic piece abuts against the triggering piece, a first clamping portion is arranged at one side end portion, away from the limiting groove, of the limiting portion, and the first clamping portion penetrates through the avoidance hole to be connected with the triggering piece.

An angle grinder comprises the switching mechanism with a mechanical power-off protection function.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model provides a switch mechanism with mechanical power-off protection function, because set up the contact connection between push rod and the shift knob, when installing the battery, the push rod is in the fourth position, and the push rod does not limit shift knob's opening, when unloading the battery, the push rod descends under the effect of first elastic component, the portion of supporting contacts with shift knob and with shift knob ejecting, make shift knob break away from first position, and then make shift knob arrive the second position, and limit shift knob get back to first position, make the circuit disconnection of connecting the motor, when installing the battery, prevent because shift knob is in first position, shift knob is in the potential safety hazard that the state caused for the motor circular telegram promptly.

2. Through setting up spring installation department, guarantee the stable connection of spring and push rod, and then guarantee the stable removal of push rod.

3. Through setting up first inclined plane and second inclined plane, realize the contact connection between push rod and the shift knob to and can make the relative motion between push rod and the shift knob more smooth and easy.

4. Through setting up spacing muscle and spacing groove, the straight line sliding track of restriction push rod for the motion (slip) process of push rod is more stable smooth and easy.

5. Through setting up dodge hole and first card portion for the connection of shift knob and trigger piece is more stable; and simultaneously, the first elastic piece and the second elastic piece are arranged, the extension of the first elastic piece can move the push rod downwards so as to finish the outward ejection of the switch button, and the elastic force of the second elastic piece drives the trigger piece to move downwards so as to drive the switch button to return to the second position from the first position.

6. The angle grinder provided by the utility model is also provided with the mechanical power-off protection mechanism, so that the switch button can be automatically positioned at the second position when the battery is pulled out, namely, a circuit connected with the motor can be automatically disconnected, and the switch button is prevented from being positioned at the first position when the battery is installed, so that potential safety hazards caused by the fact that the switch button is in an on state to electrify the motor are avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of an angle grinder according to the present utility model;

FIG. 2 is a schematic view of the overall explosive structure of an angle grinder according to the present utility model;

FIG. 3 is a schematic view of a part of the switch mechanism with mechanical power-off protection shown in part A of FIG. 2;

FIG. 4 is a schematic diagram of a switch assembly of a switch mechanism with mechanical power-off protection according to the present utility model;

FIG. 5 is a schematic illustration of a push rod in a switching mechanism with mechanical power-off protection according to the present utility model;

FIG. 6 is a schematic diagram of a switch button in a switch mechanism with mechanical power-off protection according to the present utility model;

FIG. 7 is a schematic diagram of a trigger member of a switching mechanism with mechanical power-off protection according to the present utility model;

FIG. 8 is a partial cross-sectional view of an angle grinder of the present utility model;

FIG. 9 is a partial cross-sectional view of a switch button in a first position with a push rod in a fourth position in a switch mechanism with mechanical power-off protection according to the present utility model;

FIG. 10 is a partial cross-sectional view of a switch in a first position with a pushrod in a third position in a switch mechanism with mechanical power-off protection according to the present utility model;

FIG. 11 is a partial cross-sectional view of the switch button in the second position with the push rod in the third position in a switch mechanism with mechanical power-off protection according to the present utility model;

FIG. 12 is a cross-sectional view of a portion of the structure of a switching mechanism with mechanical power-off protection according to the present utility model;

fig. 13 is a schematic view showing a partial structure of a switching mechanism with a mechanical power-off protection function shown at B in fig. 12.

In the figure: 1. a micro-switch; 11. a contact; 2. a switch button; 21. an abutting portion; 211. a second inclined surface; 22. a limit part; 221. a first clamping part; 23. a limit groove; 24. a clamping groove; 3. a push rod; 31. an unlocking part; 32. an abutting part; 33. a spring mounting portion; 34. a first inclined surface; 35. a limit rib; 36. an inner diameter limiting protrusion; 37. an outer diameter limiting plate; 4. a first elastic member; 5. a trigger; 51. avoidance holes; 52. a toggle part; 6. a second elastic member; 100. a mounting shell; 101. a clamping block; 102. cutting the sheet; 103. and a battery.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described below with reference to fig. 1 to 13 in the embodiments, and it is obvious that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it is to be understood that: the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

Examples:

as shown in fig. 1 and 2, an angle grinder includes a mounting housing 100, a cutting blade 102, a mechanical power-off protection mechanism, a motor, and a battery 103, and the mechanical power-off protection mechanism is mounted inside the mounting housing 100, and in use, the battery 103 can be slid along the inner wall of the mounting housing 100 to achieve mounting and dismounting, and the motor is turned on and off from the circuit of the battery 103 by pushing a switch button 2.

As shown in fig. 3, 4, 5, 6, 8, 9, 10 and 11: a switching mechanism with mechanical power-off protection, comprising: a micro switch 1, a switch button 2, a push rod 3 and a first elastic piece 4;

the micro switch 1 comprises a first end, a second end and a contact 52, wherein the first end is used for being connected with a battery 103, and the second end is used for being connected with a motor;

when the switch button 2 is in the first position (see fig. 9), the first end is communicated with the second end, and when the switch button 2 is in the second position (see fig. 11), the first end is disconnected from the second end;

one end of the first elastic member 4 abuts against the mounting housing 100, and the other end abuts against the push rod 3;

one end of the push rod 3 is abutted against the first elastic piece 4, the other end is abutted against the battery 103, and the push rod 3 is provided with an unlocking part 31 and an abutting part 32;

specifically, referring to fig. 4 and 5, the first elastic member 4 is a first spring; the push rod 3 is provided with a spring mounting portion 33 near one end of the first elastic member 4, and the spring mounting portion 33 includes: the inner diameter limiting bulge 36 and the outer diameter limiting plate 37, the inner diameter limiting bulge 36 is inserted into the inner ring of the first spring, a limiting gap is arranged between the inner diameter limiting bulge 36 and the outer diameter limiting plate 37, and a part of the spring is inserted into the limiting gap, so that the first spring is stably connected with the push rod 3.

As shown in fig. 3, 4, 7, 12 and 13: the micro switch further comprises a second elastic piece 6 and a leaning triggering piece 5, one end of the second elastic piece 6 butts against the installation shell 100, the other end butts against the triggering piece 5, one end of the triggering piece 5 is connected with the switch button 2, the other end of the triggering piece is connected with the micro switch 1, and the triggering piece 5 is used for triggering the micro switch 1 to enable the first end to be communicated with and disconnected from the second end.

When the switch button 2 is used, in the process from the second position to the first position, the switch button 2 drives the trigger piece 5 to move upwards, the trigger piece 5 is provided with the stirring part 52, the stirring part 52 is in contact with the lower surface of the contact 11, the trigger piece 5 moves upwards, the stirring part 52 pushes the contact 11 to move upwards, the first end and the second end are communicated, when the switch button 2 is from the first position to the second position, the switch button 2 drives the trigger piece 5 to move downwards, the stirring part 52 does not push the contact 11, the contact 11 is reset, and the first end and the second end are disconnected.

Further, the switch button 2 is provided with a locking groove 24, and the mounting housing 100 is provided with a locking block 101 corresponding to the locking groove 24, so that when the switch button 2 is in the first position (see fig. 9), the locking block 101 is locked into the locking groove 24, and the switch button 2 can be stably positioned in the first position.

In use, when the battery 103 is removed from the mounting housing 100, the first elastic member 4 stretches to enable the push rod 3 to be in a third position (refer to fig. 10), the abutting portion 32 of the push rod 3 moves downwards to be in contact with the switch button 2, the clamping groove 24 of the switch button 2 is separated from the limit of the clamping block 101 (refer to the state of fig. 10), the switch button 2 moves downwards to a second position (refer to the state of fig. 11) under the elastic force of the second elastic member 6, the abutting portion 32 of the push rod 3 can limit the switch button 2 to return to a first position, the first position is a position where the switch button 2 is located when the clamping block 101 is clamped in the clamping groove 24, the switch button 2 is in a first position where the switch button 2 is in a locking state of the switch assembly, the first end and the second end are connected together, the second position is a position where the clamping block 101 is not clamped in the clamping groove 24, the switch button 2 is in a second position where the switch button 2 is in a release state of the switch assembly, and the first end and the second end are disconnected;

when the battery is mounted in the mounting housing 100, the push rod 3 compresses the first elastic member 4, and the push rod 3 moves up to the fourth position, and at this time, the abutment portion 32 of the push rod 3 does not limit the switch button 2 to return to the first position.

The specific fourth position is the position of the push rod 3 when the push rod 3 moves up and the abutting part 21 is in a non-contact state with the push rod 3 after the battery 103 is installed, and the fourth position is set to avoid the influence of the push rod 3 on the switch button 2 in normal use, so that the switch button 2 can be switched between a release state and a locking state under manual operation.

The embodiment is suitable for the angle grinder with the buckle structure, and the arrangement of the clamping block 101 and the clamping groove 24 can ensure that the switch button 2 is not continuously pressed by fingers when being in the first position, and the switch button 2 can be stably positioned in the first position;

further, by disassembling the battery 103, the push rod 3 is automatically moved downwards to enable the abutting portion 32 to eject the abutting portion 21 outwards, namely, the clamping groove 24 of the switch button 2 is separated from the limit of the clamping block 101, and further the switch button 2 is enabled to rapidly reach the second position from the first position under the elastic force of the second elastic piece 6, so that the potential safety hazard of the switch button 2 in the first position is relieved, namely, the potential safety hazard caused by the fact that the motor is electrified in the moment of installing the battery 103 for the second time when the switch button 2 is in the on state is avoided, and the potential safety hazard caused by the rotation of the grinding wheel of the angle grinder is caused.

As shown in fig. 4, 5 and 6: a first inclined surface 34 is provided between the unlocking portion 31 and the abutment portion 32 for guiding the switch button 2 to transition between the abutment portion 32 and the unlocking portion 31. The switch button 2 is provided with an abutting portion 21 for contacting the unlocking portion 31 and the abutting portion 32, and the abutting portion 21 is provided with a second inclined surface 211 for cooperation with the first inclined surface 34.

Specifically, taking the direction in the drawing as an example, the unlocking portion 31 and the abutting portion 32 are both planes in the vertical direction.

Referring to fig. 9, when the battery is mounted in use, the battery supporting push rod 3 moves upwards to compress the first elastic member 4, the clamping groove 24 is clamped on the clamping block 101, and the abutting part 21 is positioned at the unlocking part 31; referring to fig. 10, after the battery 103 is pulled out, the push rod 3 is lowered by the elastic force of the first elastic member 4, and the abutting portion 32 is slidably abutted against the second inclined surface 211 by the sliding contact between the first inclined surface 34 and the second inclined surface 211, so that the abutting portion 21 is pushed out.

As shown in fig. 4 to 6: the push rod 3 is provided with a limit rib 35, the switch button 2 is provided with a limit part 22, a limit groove 23 is formed on the limit part 22, the limit groove 23 is matched with the limit rib 35, and the limit rib 35 can slide in the limit groove 23.

As shown in fig. 6, 7 and 8: the trigger 5 is provided with a relief hole 51, and the stopper 22 is elongated and can pass through the relief hole 51.

Referring to fig. 6, a first engaging portion 221 is provided at an end of the limiting portion 22, which is remote from the limiting groove 23, and the first engaging portion 221 is connected to the trigger 5 through the escape hole 51.

In use, since the limiting portion 22 passes through the avoidance hole 51, and whether the switch button 2 is moved from the second position to the first position or from the first position to the second position, the switch button 2 and the trigger 5 can be moved up and down together, and the first clamping portion 221 is provided to enable the trigger 5 to be ejected out together with the switch button 2.

Working principle: when the switch button is used, a battery is arranged, the battery pushes the push rod 3 to move upwards, the push rod 3 reaches a fourth position from a third position, at the moment, the first elastic piece 4 is in a compressed state under the action of the push rod 3, the push rod 3 has no limit on the position of the switch button 2, at the moment, the switch button 2 can be manually operated, when the switch button 2 is in a first position, the clamping groove 24 is clamped on the clamping block 101, the trigger piece 5 moves upwards to compress the second spring piece 6, the contact 11 on the micro switch 1 is pushed by the stirring part 52 to connect the first end with the second end, the motor is electrified to work, after the battery 103 is pulled out, the push rod 3 moves downwards along the limiting groove 23 under the action of the first elastic piece 4, at the moment, the abutting part 32 contacts with the abutting part 21, the abutting part 21 is outwards ejected by the abutting part 32, the switch button 2 is rotated, the clamping groove 24 is separated from the limit of the clamping block 101, then the trigger piece 5 moves downwards under the action of the second elastic piece 6, and drives the switch button 2 to move downwards through the avoidance hole 51, so that the switch button 2 is reset to the second position from the first position, at the moment, because the push rod 3 moves downwards to the third position, if someone tries to move the switch button 2 upwards to the first position, the abutting part 32 always abuts against the abutting part 21, so that the clamping groove 24 cannot be matched with the clamping block 101, under the action of the second elastic piece 6, the switch button 2 also resets to the second position under the action of no manual operation, so that the switch button 2 cannot be in the first position before the battery 103 is installed next time, at the moment, the toggle part 52 on the trigger piece 5 does not push the contact, the contact 11 resets, the first end and the second end are disconnected, the motor is completely prevented from being powered off, the potential safety hazard brought by the second power-on state of the switch button 2 is closed, and the whole process, the reset of the switch button 2 can be automatically completed only by taking off the battery 103 manually, and the operation is convenient.

While the basic principles and main features of the present technical solution and advantages of the present technical solution have been shown and described above, it will be apparent to those skilled in the art that the present technical solution is not limited to the details of the above-described exemplary embodiments, and that the present technical solution can be implemented in other specific forms without departing from the spirit or essential features of the present technical solution. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to specific embodiments, and that the embodiments described in the examples can be combined as appropriate to form other embodiments that will be understood by those skilled in the art.

Claims (10)

1. A switching mechanism having a mechanical power-off protection function, mounted on a mounting housing (100) of an electric tool, comprising:

the micro switch (1) comprises a first end, a second end and a contact, wherein the first end is used for being connected with a battery, and the second end is used for being connected with a motor;

the switch assembly is positioned at a first position, the contact (52) is pressed to enable the first end and the second end to be conducted, the contact (52) is released when the switch assembly is positioned at a second position, and the contact (52) is automatically reset to enable the first end and the second end to be disconnected; and

a power-off protection assembly for placing the switch assembly in a second position when the battery (103) is not installed.

2. A switching mechanism with mechanical power-off protection according to claim 1, wherein the switching assembly comprises: a switch button (2) and a trigger piece (5), wherein when the switch button (2) is in a first position, the trigger piece (5) presses the contact; when the switch button (2) is in the second position, the trigger piece (5) releases the contact.

3. A switching mechanism with mechanical power-off protection according to claim 2, wherein the power-off protection assembly comprises: a first elastic piece (4) and a push rod (3), wherein one end of the first elastic piece (4) is propped against the mounting shell (100); the other end is propped against the push rod (3),

one end of the push rod (3) is used for abutting against the battery (103), and an unlocking part (31) and an abutting part (32) are arranged on the push rod (3);

after the battery is dismounted from the mounting shell (100), the elastic piece (4) is in an extension state and abuts against the push rod (3), so that the push rod (3) is in a third position, the abutting part (32) abuts against the switch button, the switch button (2) is separated from the first position, and the switch button (2) is limited to return to the first position;

when the battery is mounted on the mounting housing (100), the push rod (3) compresses the first elastic piece (4), and the push rod (3) is in a fourth position and does not limit the switch button (2).

4. A switching mechanism with mechanical power-off protection according to claim 3, characterized in that the first elastic element (4) is a first spring;

one end of the push rod (3) is provided with a spring mounting part (33), and the spring mounting part (33) comprises: the inner diameter limiting protrusion (36) and the outer diameter limiting plate (37), the inner diameter limiting protrusion (36) is inserted into the inner ring of the first spring, a limiting gap is formed between the inner diameter limiting protrusion (36) and the outer diameter limiting plate (37), and a part of the spring is inserted into the limiting gap, so that the first spring is stably connected with the push rod (3).

5. A switching mechanism with a mechanical power-off protection function according to claim 4, characterized in that a first inclined surface (34) is provided between the unlocking part (31) and the abutment part (32) for guiding the switching button (2) to transition between the unlocking part (31) and the abutment part (32).

6. A switching mechanism with a mechanical power-off protection function according to claim 5, characterized in that the switch button (2) is provided with an abutment (21) for contacting the unlocking portion (31) with the abutment (32); the abutting part (21) is provided with a second inclined surface (211) for guiding the switch button (2) to transition between the unlocking part (31) and the abutting part (32).

7. The switch mechanism with the mechanical power-off protection function according to claim 4, wherein the push rod (3) is provided with a limit rib (35), the switch button (2) is provided with a limit part (22), a limit groove (23) is formed on the limit part (22), the limit groove (23) is matched with the limit rib (35), and the limit rib (35) can slide in the limit groove (23).

8. The switch mechanism with the mechanical power-off protection function according to claim 7, wherein the trigger piece (5) is provided with an avoidance hole (51), and the limit portion (22) is in a strip shape and penetrates through the avoidance hole (51).

9. The switching mechanism with the mechanical power-off protection function according to claim 8, further comprising a second elastic member (6), wherein one end of the second elastic member abuts against the mounting housing (100), the other end of the second elastic member abuts against the triggering member (5), a first clamping portion (221) is arranged at one end portion of the limiting portion (22) away from the limiting groove (23), and the first clamping portion (221) penetrates through the avoidance hole (51) to be connected with the triggering member (5).

10. An angle grinder, characterized by comprising a switching mechanism with a mechanical power-off protection function according to any one of claims 1 to 8.